Logging huge tracklogs - Was [OSM-talk] South Downs Way

[Gabriel Ebner]

On Sun, Jul 09, 2006 at 06:53:32PM +0100, Barnett, Phillip wrote:
> The recent firmware update for Garmin Legend CX to 2.50 added the
> facility to log tracks to the MicroSD  datacard. If you enable this, it
> creates a fresh tracklog every day and stores each daily log as a GPX
> file.
> As the Garmin manual says, 'Log track to Data card - Records the current
> track log data to the microSD card in addition to the unit's internal
> memory. This feature is a tool for use by advanced GPS users with
> special applications for the tracklog data. Track logs on the data card
> are .gpx GPS position data files, and are not used by your unit.'
> The default microSD card is 32Mb, or 64Mb if you're lucky like me (more
> than advertised, in other words) 1Gb microSD cards are about 30 quid in
> the UK. How many track points can you get into a 1 Gb card at one point
> per second?
> My rough estimate is about a year and a half.

Each point takes 116 bytes, so on a 950M card there should be room for about
8587475.86 nodes (not counting headers), that makes around 99.39 days of
continous 1 pt/s logging, so if you just log 4 hours a day the card will last
for 596.35 days, that's 1.63 years.

  Gabriel.